Good working effects pedal.
The Vox V850 is a passive volume pedal featuring a sturdy "blue-finish" chassis identical to classic Vox wah-wah pedals. Designed for guitars, basses, and keys, it utilizes a 250K audio taper potentiometer for smooth control, requiring no external power. It can be placed in the signal chain or used with the Valvetronix VC-4 Foot Controller. 

Key Specifications and Features:

• Type: Passive volume pedal.
• Construction: Heavy-duty metal housing (similar to Wah pedals).
• Potentiometer: 250K audio taper.
• Connections: Input/Output jacks for instrument cables; compatible with VC-4 Foot Controller.
• Finish: Distinctive blue finish.
• Operation: No batteries or power supply needed. 

Description:
The V850 offers high-quality, reliable, and durable performance, sturdy enough for intense stage use. It provides a smooth increase in volume. It is well-regarded for its rugged build and simplicity. 

ATTENTION:

I sell TOOLS for musicians...not museums or collectors. If you are looking for a great working tool for creating music and gigging, I believe you will be comfortable working with me. If you are looking for a piece for your personal museum, please leave me out of your purchasing process! I have ZERO patience for the anal retentive collector and we will just be wasting each others time and testing the extent of our patience. Additionally, and with all respect, your purchase does not mean that the seller is responsible for teaching you to use your product nor are we responsible to force YOU to read the manual.